FIX: include tar in bcl2fastq and bclconvert

[maxulysse]

• include tar in bcl2fastq and bclconvert modules + remove untar from bcl_demultiplex subworkflow

PR checklist

Closes #XXX

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[matthdsm]

I'm not sure I like bcl* being $args3 here. One would expect ext.args for a bcl* module to affect the "main" executable and not the ancillary one(s)